REPLACEMENT GEARBOXES and GEARS available from Loco Doc
GEARBOXES FOR 3MM AXLES (USED ON ALMOST ALL HO BRASS)
ALMOST ALL GEARBOXES ARE SOLD-OUT AT THE SOURCE. INQUIRE ABOUT AVAILABILITY AND PRICE.
|# of Idlers||1||1||0||1||0||1||2||0||1||0||1||1|
POLISHED STEEL WORMS TO REPLACE WORN AND DEFECTIVE GEARS
The worm is the most easily damaged gear and will destroy the gear it drives if it has a rough tooth surface or if it is damaged. The worm MUST be made of a discimilar and harder material than the gear it drives. Poor quality, worn or soft brass worms should be replaced before they damage other gears.
I always replace any brass worm with a NWSL polished steel worm. It is a very cheap investment in longer gear life. A Standard worm has threads running like a screw or bolt and runs foreward turning clockwise. A reverse worm is opposite.
The worm gear pitch (tooth size) and cut (direction) must be matched to the gears it will mesh with and the shaft hole matched to the shaft it mounts on.
REPLACEMENT STEEL WORMS
|1.2MM SHAFT||10800-6x +||10801-6 +||50800-6 +|
|1.5MM SHAFT||1313-6 ^||1335-6 ^||10400-6 x||10401-6 x||50400-6 +|
|2.OMM SHAFT||1312-6 ^||1334-6 ^||10500-6 x||10501-6 x||50500-6 +|
|2.4MM SHAFT||230600-6 -||230601-6 ^||10000-6 0||10001-6 x||50600-6 -||50601-6 -|
POLISHED 2.5 MOD STEEL WORMS FOR PRECISION SCALE K-28, K-36
and K-37 (Korea)
These models had very fine tooth soft brass worms that wore out quickly. We produce 2.5 mod steel worms that will last but the worm is slightly larger in diameter so I have to modify the worm shaft bearings to get proper gear mesh. I also replace the soft steel worm shaft in K-36 and K-37 gearboxes with hardened steel motor shaft stock for longer life and reduced bearing wear. Phone to schedule shop time. Price is $60 per gearbox.
LOCODOC DELRIN IDLER GEAR UPGRADES FOR HOn3 WESTSIDE LOCOMOTIVES
Quite a few very good HOn3 locomotives built by Nakamura were produced with a brass worm driving brass idler gears rotating on 3mm brass shafts. A rule of gear design is that the worm must be made of a harder and discimilar material than the "worm gear" it drives and the pivot shaft must be a smooth and harder material than any gear rotating on it. Many locomotives ( Lambert C&S 2-6-0 , Westside C-25, K-37, compound K-27, original slide valve K-27 and possibly others ) should have their brass idler gears replaced with delrin gears.
If the shaft is worn or if you want a quieter, smoother and lower friction drive that provides much truer gear mesh and increases flywheel coast, LocoDoc has developed a custom NWSL made 26 tooth delrin idler gear mounted on a 1.5mm hardened steel shaft for greater stability. It also includes two custom brass bearings to fit the shaft and center the gear in the gearbox. This is a big improvement over the NWSL 305-6 gear that loosly mounts on the original large 3mm. brass pivot shaft. Since the gearboxes have different widths, please specify which model it will be installed in as the bearing widths needs to be machined to match the gearbox width.
LocoDoc #305 delrin idler gear upgrade ( PHOTO )Specify model $30
LocoDoc #SP 4-6-0 #9 and #18 last run with brass idler gear, delrin idler gear upgrade, SEE K-6 A description, $20
LocoDoc #NCNG 2-8-0 (and SP #1) delrin idler gear upgrade, SEE K-6AN description, $20
LOCODOC DELRIN IDLER GEARS FOR KEY MODELS
Several models built by Samhongsa had brass idler gears which tend to be noisy and wear out and several rotate on brass sholdered screws, a short lived design. The following delrin idler gears are custom made by us using NWSL gear stock.
LocoDoc C&S #22 2-6-0 ( PHOTO ) $20
LocoDoc C&S #58 2-8-0 (also #60, #65 & #69) ( PHOTO ) & PSC 1st.run (open gear) RGS 4-6-0s $20
LocoDoc RGS #42 2-8-0 This is a corrected (sleaved down)NWSL #2177 $20
LocoDoc C&S #71 2-8-0 This is a corrected NWSL #2177 (bored out or sleaved)
There are two versions; 3.1mm. (.122") and 1.9mm. (.74") pivot screws. Specify which. $20
NWSL DELRIN IDLER GEARS TO UPGRADE HOn3 LOCOMOTIVES
NWSL #305-6 to replace brass idler gears in Nakamura made HOn3 locos $6.95
NWSL #2146 FOR WS & Balboa(2nd run) D&RGW T-12 originly made for me $11.95
NWSL #2154 FOR WS WSLC #3 steel worm to replace soft brass one $9.95
NWSL #2161 FOR WS NCNG #9 but not SP#18 (with idler gear) have 2.4mm hole, needs 2.5 mm hole $9.95
NWSL #2177 FOR Key C&S #71 and RGS #42, requires modifying the pivot hole $9.95
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